Answering machine does not reactThe FRITZ!Box's answering machine does not react to calls. Callers do not hear a greeting and cannot leave a message.Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.Shortening answer delay or reconfiguring the answering machine Click "Telephony" in the FRITZ!Box user interface. Click "Telephony...
> https://en.avm.de/service/knowledge-base/dok/FRITZ-Box-7690/1510_Answering-machine-does-not-react/
Enabling keylock on FRITZ!FonIf you lock the keys on your FRITZ!Fon, you can only call emergency numbers and answer incoming calls. In the settings of the telephone you can select whether the buttons should be unlocked or remain locked when you receive a call. Depending on the setting, you either have to briefly press the end call key or hold it down to hang up.1 Enabling keylock for calls Press...
> https://en.avm.de/service/knowledge-base/dok/FRITZ-Box-7690/1396_Enabling-keylock-on-FRITZ-Fon/
Cannot enable DECT Eco functionFor technical reasons, the "DECT Eco" function is not available if a smart home device (for example FRITZ!DECT 200), a FRITZ!DECT Repeater 100, or a FRITZ!Box in DECT repeater mode is registered with the FRITZ!Box. Note:If you are no longer using the above-mentioned devices, you can delete them in the menu "Smart Home" or "Telephony > DECT > Monitor" in the FRITZ!Box...
> https://en.avm.de/service/knowledge-base/dok/FRITZ-Box-7690/1238_Cannot-enable-DECT-Eco-function/